The boulder population of asteroid 4 Vesta

These are data described in the paper "The boulder population of asteroid 4 Vesta: Size-frequency distribution and survival time" by Schröder et al., submitted to Earth &amp; Space Science (Wiley). The data concern boulder counts for craters on the asteroid Vesta. Boulder counts for all 69 craters in Table 1 of the paper are provided as text files with 3 columns: (1) longitude and (2) latitude, both in degrees, and (3) boulder diameter in meters. Generally, boulder identifications are only reliable above 3 image pixels (60 m), but the data files contain all boulders that we (tentatively) identified, including those smaller than 60 m. We also provide figures in PDF format, one for each crater, of the spatial boulder distribution. The figures have the format of Fig. 6 in the paper: Green, small dots represent boulders with a size between 3 and 4 pixels (60 m &lt; d &lt; 80 m). Red, large dots represent boulders larger than 4 pixels (d &gt; 80 m). Boulders smaller than 60 m are not shown.本数据集源自施罗德（Schröder）等人提交至《Earth & Space Science（Wiley）》的论文《4号小行星灶神星（Vesta）的砾石（boulder）群体：尺寸频率分布与存活时长》。本数据集聚焦于该天体表面撞击坑（crater）的砾石计数工作。论文表1中收录的全部69个撞击坑的砾石计数以文本文件形式提供，该类文件共包含三列数据：(1) 经度（单位：度）、(2) 纬度（单位：度），以及(3) 砾石直径（单位：米）。通常而言，仅当砾石尺寸大于3个图像像素（对应60米）时，其识别结果才具备可靠性，但本次提供的数据文件涵盖了我们（初步）识别出的全部砾石，其中亦包含尺寸小于60米的砾石。我们还为每个撞击坑提供了PDF格式的空间砾石分布图像，此类图像采用论文中图6的格式：绿色小点代表尺寸介于3至4个像素之间（60米 < d < 80米）的砾石；红色大点代表尺寸大于4个像素（d > 80米）的砾石；尺寸小于60米的砾石未在图像中展示。